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Study on the Distribution of Interlayer in Thick Sandy Braided River under Large Well Spacing—A Case of C Oilfield in bohai Sea

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Open Journal of Geology 2022年第6期12卷 460-471页

作者： Wentong Zhang Bo Quan Songru Mu Jie Tan Qing Zhou bohai Oilfield Research Institute CNOOC Ltd. Tianjin China

Using core, logging and other data, combined with field outcrop deposition, this paper studies the sedimentary genetic types and sedimentary stages of thick sandy braided river interlayer in C oilfield, and divides two stages of interlayer and three single-stage braided flow zones. On this basis, geostatistical inversion constrained by logging and discerning River quantitative knowledge base is carried out to predict the distribution range of the main interlayer in the two phases. The production performance test of the blind well and horizontal well shows that the coincidence rate of the prediction results of interlayer with thickness > 1.5 m is 75%. The research shows that the first stage is the main interlayer, mainly composed of mudstone of flood plain origin, with an average thickness of 2.1 m and relatively stable distribution. Based on the interlayer prediction results, the small layer of composite sand body 1 forms a residual oil enrichment area in the high part of the structure due to the wide range of interlayer shielding in the lower part, which is a favorable area for adjusting and tapping potential.

关键词： bohai Oilfield Braided River Horizontal Well Geostatistical Inversion Interlayer Prediction

Diagnostic Method and Adaptability Analysis of Multiple Water Breakthroughs in Horizontal Well in Combined Well Pattern

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Journal of Geoscience and Environment Protection 2023年第5期11卷 150-158页

作者： Zheng Lv Meinan Wang Guohao Zhang Rui Zhang Jianguo Liu bohai Oilfield Research Institute of cnooc Ltd.-Tianjin Branch Tianjin China

The combined well pattern has been widely used in reservoir development, with a common pattern being a horizontal well in the center for oil production and multiple vertical wells around for water injection. For this type of well pattern, determining the horizontal well is affected by which injection wells, especially when the injecting water breaks through, accurately determining the direction of water inflow will provide an important basis for targeted water well measures. Based on the production performance data of horizontal wells, the semi logarithmic relationship curves of water-oil ratio, derivative water-oil ratio, and cumulative production were used for the first time to determine the breakthrough problem of water injection in the surrounding water injection wells of horizontal wells based on their response characteristics. The adaptability of this method under different influencing factors was analyzed. Introducing the parameter of cumulative production not only preserves the variation trend of the derivative of water-oil ratio with time, but also facilitates the processing of actual production data.

关键词： Combined Well Pattern Multiple Water Breakthroughs in Horizontal Derivative of Water-Oil Ratio

Development characteristics of the fault system and its control on basin structure, Bodong Sag, East China

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Petroleum Science 2013年第4期10卷 450-457页

作者： Wu Zhiping Cheng Yanjun Yan Shiyong Su Wen Wang Xin Xu Changgui Zhou Xinhuai China University of Petroleum Tianjin Technical Department CNOOC

The Bodong Sag,located in the bohai Sea,offshore China,is one of the most petroliferous basins in *** on three dimensional seismic reflection data and time slice data,we analyze the fault system of the Bodong area in detail,establish the fault structure pattern of different types and summarize the distribution of the fault *** is concluded that the development characteristics of the Cenozoic fault system are in accordance with the dextral stress field of the Tanlu Fault,which displayed a brush structure with NNE strike-slip faults as its principal faults,NE-trending extensional faults as secondary faults and EW-trending faults as minor *** can be divided into （1） strike-slip type,（2） extensional type,（3） strike-slip extensional type and （4） extensional strike-slip *** spatial structures of different faults have obvious differences because of the fault properties and activity *** fault system at different stages shows tremendous differences because of the transition of the Tanlu Fault from sinistral strike-slip to dextral strike-slip,the transition between extension and strike-slip,and the transition from mantle upwelling to thermal *** to the controlling effect of faults on basin structure,the Cenozoic basin experienced four evolutionary stages,（a） transition stage from sinistral strike-slip to dextral strike-slip,（b） strike-slip extensional faulted stage,（c） extensional strike-slip faulted stage and （d） strike-slip depression *** identification of temporal and spatial differences of faults could be used as a significant guideline for oil and gas exploration in the Bodong area.

关键词： Fault system basin structure Bodong area

Establishment of Unstable Flow Model and Well Testing Analysis for Viscoelastic Polymer Flooding

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World Journal of Engineering and Technology 2023年第2期11卷 273-280页

作者： Zheng Lv Meinan Wang bohai Oilfield Research Institute of cnooc Ltd. Tianjin Branch Tianjin China

At present, the polymer solution is usually assumed to be Newtonian fluid or pseudoplastic fluid, and its elasticity is not considered on the study of polymer flooding well testing model. A large number of experiments have shown that polymer solutions have viscoelasticity, and disregarding the elasticity will cause certain errors in the analysis of polymer solution seepage law. Based on the percolation theory, this paper describes the polymer flooding mechanism from the two aspects of viscous effect and elastic effect, the mathematical model of oil water two-phase three components unsteady flow in viscoelastic polymer flooding was established, and solved by finite difference method, and the well-test curve was drawn to analyze the rule of well test curve in polymer flooding. The results show that, the degree of upward warping in the radial flow section of the pressure recovery curve when considering polymer elasticity is greater than the curve which not considering polymer elasticity. The relaxation time, power-law index, polymer injection concentration mainly affect the radial flow stage of the well testing curve. The relaxation time, power-law index, polymer injection concentration and other polymer flooding parameters mainly affect the radial flow stage of the well testing curve. The larger the polymer flooding parameters, the greater the degree of upwarping of the radial flow derivative curve. This model has important reference significance for well-testing research in polymer flooding oilfields.

关键词： Polymer Flooding Viscoelasticity Well Testing Mathematical Model Seepage Law

Study on Geological Genesis and Sedimentary Model of Complex Low Resistivity Reservoir in Offshore Oilfield — A Case of NgIII Formation of X Oilfield in bohai Sea

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Journal of Geoscience and Environment Protection 2023年第4期11卷 157-169页

作者： Wentong Zhang Jie Tan Feiteng Wang Songru Mu Bowei Liu bohai Oilfield Research Institute CNOOC Ltd.-Tianjin Tianjin China

In order to study the micro genetic mechanism and main geological controlling factors of low resistivity reservoir in NgIII formation of X oilfield in bohai sea in China, the clay mineral composition, irreducible water saturation, salinity and conductive minerals of low resistivity reservoir were studied by using the data of core, cast thin section and analysis, and compared with normal resistivity reservoir. At the same time, the control effect of sedimentary environment on low resistivity reservoir was discussed. The results show that the additional conductivity of high bound water content and high montmorillonite content in the reservoir together leads to the significant reduction of reservoir resistivity, which is the main microscopic cause of the formation of low resistance, and is mainly controlled by the sedimentary background such as paleoclimate and sedimentary cycle. During the deposition period of NgIII formation, the paleoclimate was dry and cold, and it was at the end of the water advance of the medium-term sedimentary cycle. The hydrodynamic force of the river channel was weak, the carrying capacity of the riverbed was weak, and the river channel swayed frequently, resulting in fine lithologic particle size, high shale content and complex pore structure of the reservoir, resulting in significant reduction of reservoir resistance. The research conclusion would have strong guiding significance for the development of low resistivity reservoirs in this area.

关键词： Low Energy Braided River Low Resistivity Reservoir Irreducible Water Saturation Clay Minerals Paleoclimate Hydrodynamic Force

A Case of Multi-Stage Fracturing Horizontal Well Used in BZ Oilfield in bohai Bay Low-Permeability Oilfield Development

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Journal of Geoscience and Environment Protection 2020年第7期8卷 147-154页

作者： Xiujuan Zhao Chuanjun Wang Quanlin Wang Jie Tan Wei Yang bohai Oilfield Research Institute of cnooc Ltd.-Tianjin Branch Tianjin China

BZ oilfield in bohai Bay of China was a typical offshore low permeability oilfield, which was restricted by many factors such as environment and economy. In this paper, the development characteristics of BZ oilfield were summarized in depth, and the new development mode of offshore low-permeability oilfield was explored from reservoir prediction, well spacing and fracturing technology. Taking BZ oilfield as an example, a set of technical system for the effective development of offshore low permeability oilfield had been formed through research, which mainly includes reservoir prediction and evaluation of offshore middle and deep low permeability oilfield, optimization of horizontal well pattern, multi-stage fracturing design of horizontal well and other technologies. The results show that improving the resolution of seismic data, strengthening the analysis of seismic reflection characteristics and carrying out the comprehensive study of seismic geology were the keys to solve the reservoir prediction of offshore low-permeability oil fields. Multi-stage fracturing horizontal well pattern is the main pattern of offshore low-permeability oilfield development. The parameters of multi-stage fracturing horizontal well together affect the development effect. Selecting the optimal fractured horizontal well pattern can greatly improve the development effect. The successful combination and application of new technology system was the foundation and core of conquering offshore low-permeability oil fields. On the basis of understanding the geological characteristics of oil reservoirs, it is an effective means of developing offshore low-permeability oil fields by selecting reasonable production methods, well types and well patterns. Using efficient perforation and fracturing technology to successfully control fracture parameters and form optimal injection and production well pattern was the key to improve low permeability offshore oil fields.

关键词： Low Permeability Offshore Oil Field Multi-Stage Fracturing Horizontal Well Pattern

Analysis of Factors Influencing Shut in Pressure Cone in Offshore Strong Bottom Water Reservoir

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Journal of Geoscience and Environment Protection 2021年第4期9卷 166-175页

作者： Jie Tan Enhui Sun Dongdong Yang Wentong Zhang Songru Mou bohai Oilfield Research Institute Tianjin Branch of CNOOC Ltd. Tianjin China

X oilfield is an offshore strong bottom water reservoir with water cut up to 96% at present, and liquid extraction has become one of the main ways to increase oil production. However, the current liquid production of the oilfield reaches 60,000 m3/d due to the limitation of offshore platform, well trough and equipment, the oilfield is unable to continue liquid extraction. In order to maximize the oil production of the oilfield, it is necessary to study the strategy of shut in and cone pressure. Through numerical simulation, this paper analyzes the influence of different factors, such as crude oil density, viscosity, reservoir thickness, interlayer, permeability and so on, on the drop height of water cone and the effect of precipitation and oil increase after well shut in. At the same time, the weight of each factor is analyzed by combining the actual dynamic data with the fuzzy mathematics method, and the strategy of well shut in and cone pressure is formulated for the offshore strong bottom water reservoir. It provides the basis and guidance for the reasonable use of shut in pressure cone when the reservoir with strong bottom water meets the bottleneck of liquid volume.

关键词： Offshore Strong Bottom Water Reservoir Shut in Pressure Cone Precipitation to Increase Oil Production Fuzzy Mathematics

Hydrocarbon charge history of the Paleogene reservoir in the northern Dongpu Depression,bohai Bay Basin,China

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Petroleum Science 2016年第4期13卷 625-641页

作者： You-Lu Jiang Lei Fang Jing-Dong Liu Hong-Jin Hu Tian-Wu Xu School of Geosciences China University of PetroleumQingdao 266580ShandongChina cnooc Research Institute Beijing 100028China SINOPEC Zhongyuan Oil company Puyang 457001HenanChina

The hydrocarbon charge history of the Paleogene in the northern Dongpu Depression was analyzed in detail based on a comprehensive analysis of the generation and expulsion history of the major hydrocarbon source rocks, fluorescence microscopic features and fluid inclusion petrography. There were two main stages of hydrocarbon generation and expulsion of oil from the major hydrocarbon source rocks. The first stage was the main hydrocarbon expulsion stage. The fluorescence microscopic features also indicated two stages of hydrocarbon accumulation. Carbonaceous bitumen, asphaltene bitumen and colloidal bitumen reflected an early hydrocarbon charge, whereas the oil bitumen reflected a second hydrocarbon charge. Hydrocarbon inclusions also indicate two distinct charges according to the diagenetic evolution sequence, inclusion petrography features combined with the homogenization temperature and reservoir burial history analysis. According to these comprehensive analysis results, the hydrocarbon charge history of the Paleogene reservoir in the northern Dongpu Depression was divided into two phases. The first phase was from the late Dongying depositional period of the Oligocene to the early uplift stages of the late Paleogene. The second phase was from the late Minghuazhen period of the Pliocene to the Quaternary. Reservoirs formed during the first period were widely distributed covering the entire area. In contrast,reservoirs formed during the second period were mainly distributed near the hydrocarbon generation sags. Vertically, it was characterized by a single phase in the upper layers and two phases in the lower layers of the Paleogene.

关键词： Dongpu Depression Hydrocarbon charge history Hydrocarbon generation and expulsion history Fluid inclusion Petrography Fluorescence microscopy

Research on Optimization Design of Deep Profile Control Injection Scheme in Block S

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Open Journal of Applied Sciences 2023年第11期13卷 2047-2054页

作者： Meinan Wang Shaopeng Wang Wei Zhang Xiaoqi Chen Junting Zhang bohai Oilfield Research Institute of cnooc Ltd.-Tianjin Branch Tianjin China

In view of the rapid decline rate of oil production and gradual increase of water cut in oil wells in Block S, based on the determination of the formula of foam profile control agent, the optimization study of foam profile control injection scheme was carried out. Petrel software is used to establish a facies controlled geological model based on stochastic modeling method in Block S, and CMG software is used for numerical simulation to design 7 sets of foam profile control prediction schemes. Dynamic data and numerical simulation methods are used to optimize foam injection mode and injection cycle. By simulating and calculating, the optimal injection method of alternating gas and liquid injection and the optimal plan with an injection period of 2 months were selected. Through the calculation results of various research plans, it can be seen that the water content of the optimal plan has decreased significantly, and the oil production rate has increased significantly, in order to slow down production decline, control water content rise, extend the economic recovery period of the oilfield, and achieve the goal of improving oil recovery.

关键词： Foam Profile Control Numerical Simulation Injection Method Injection Cycle